Bag-bottom-forming machine



'Sept. 9 1924. 1,508,125

F. T. ROBINSON BAG BOTTOM FORMING MACHINE Filed May 26 1923 4 Sheets-Sheet 1 mum! 77 INVENTOR F l Ira/7201's TRobz'nsom ATTORNEYS Sept. 9, 1924. 1,508,125 F. T. ROBINSON BAG BOTTOM FORMING MACHII W Filed May 26. 192:: 4 Sheets-Sheet z 4 f: a I 0L T;

IN VENTOR Francis ZRobinson A TTORNE Y3 Sept. 9 1924. v

F. T. ROBINSON BAG BOTTOM FORMING MACHINE Filed May 26. 1923 4 Shets-Sheet 3 IN VEN TOR A TTORNE Y5 Sept. 9 1924 F. T. ROBINSON BAG BOTTOM FORMING MACHINE Filed May 26.

. J. a n i: u u m m I w T n m2 M H u w n f n K m M m -ol nl hwo B) m 8 G u n N u 1111 ll I l l I l I l I... \\Q u Patented Sept. 9, i924.

UIT srrs ATE'NT o e-rice.

FRANCIS T. ROBINSON, OF BROOKLYN, NEW YORK, ASSIGNO'R TO ABKELL SAFETY BAG- COMPANY, OF NEW YORK, N. Y., A CORPORATION OF YORK.

BAG-BOTTOM-FORMING MACHINE.

Application filed May 26, 1923. Serial No. 641,535.

To aZZ whom it may concern:

Be it known that FRANCIS T. ROBINSON, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, and State of New York, has invented new and useful Improvements in Bag-Bottom- Forming Machines, of which the following is a specification.

The present invention relates to bag bottom forming machines and more particularly to a machine on which fiat bags, Without a formed bottom, may be converted into bags having a formed flat bottom suitable for use as linings for barrels, boxes or the like.

Paper bags are commonly made fiat by folding a rectangular pa er blank upon it self and pasting or stitc ing the opposite edges of the blank at the bottom and at one side. These fiat bags do not have a formed bottom, i. e. one which will open out flat, and, hence, have not been considered suitable linings for boxes, barrels or the like. laper bags known as square bottom bags" (whose bottoms are merely rectangular) are also made with fiat or formed bottoms by cutting, folding and pasting the paper in a predetermined more complicated manner. In these bags the bottom is self-supporting and when the bag is filled with loose material the bottom is substantially fiat and is so held on account of the construction of the bag. These square bottom bags are always more expansive to manufacture than the fiat bags first referred to, and particularly so when made in large sizes. A formedaottom bag of the proper size may be used as a box lining and heretofore such linings have been made. The paper was cut, folded and pasted, the operation being carried on to quite an extent by hand on account of the size of automatic machinery that would be needed. Another reason why the large box lining is costly is the enormous variation of dimension in boxes of substantially the same contents.

Vhile a square bottom bag can be made to fit practically any; flat bottom. rectangular box, it is unsuited for use as a linfor barrels or the like. Where it is desired to line these round) containers. a specially designed lining has been used. For example, linings for kegs and barrels have been made by taking a tube and sewing in a round bottom. Sucha lining is shown in Blanchard Patent No, 698,790, dated April 29, 1902. These linings are made by crinkling paper in the web, severing the paper into sheets, and sewing or pasting the sides to form a tube. The bottom is completed by sewing in a round piece of crinkled paper. A considerable amount of skilled labor is necessary, especially for cut ting the roundbottom and for operating the sewing machine for sewing in the round bottom; considerable paper is wasted in making the round bottom.

Flat bags may be formed in several ways. A rectangular blank may be folded upon itself and the bag completed by'fastening together the two parallel open edges, or the edges at one end and the side opposite the fold may be fastened together, or the bag -may be made by folding the margins of a blank down upon the central portion, the

edges of the margin meeting, and then fastening the marginal edges together and the end formed by one of the doubled edges of the blank, or the bag may be formed as on Arkell Patent No. 642,061 dated January Flat bags of the typesabove referred to are the most inexpensive bags made. But they are not suitable for linings, because theywill not fit into] a barrel or box and extend clear to the corners'and inside edges. Unless the linings fit the boxes or barrels pressure may soon rupture'them.

In the drawings accompanying the present application the only type of bag shown is the one in which the blank is folded to form a collapsed tube and then the end of this tube is closed along a straight line, but it is to be understood that any of the types of bag above described, or any other type of flat bag without a formed bottom may be used as a blank for conversion into a bag or lining with a formed fiat bottom.

The properties imparted to paper by crinkling makes it of great value as a packing material; but to preserve these valuable properties it is necessary to handle the paper in a radically diflerent'manner from that which is common. for smooth paper; the crinkles must be preserved. Hence, special methods have been developed for manipulating'this paper, and the articles made from it. Ordinary bag making machines, for making grocers bags, would be wholly unsuited for making a crinkled paper bag. The present invention has been developed particularly by reason of the pe culiarities of crinkled paper.

The principal object of the present invention is to provide a machine on which bags or linings with formed flat bottoms may be expeditiously made out of flat bags without a formed bottom and preferably one on which the formed flat bottom bags may be collapsed for shipment.

The accompanying drawings show for the purposes of illustration two of the many embodiment-s in which the present invention may take form, one illustrating a machine arranged for making round bottom bags and the other a machine for making square bot tom bags.

In these drawings:

Fig. 1 is an elevation of a machine for forming round bottoms showing the parts in one position;

Fig. 2 is an elevation taken in the direction of the arrow 2 of Fig. 1, showing the parts in collapsed position;

Fig. 8 is a top plan view of a folding table in the position of Fig. 1;

Figs. 4 and 5 are side and end views illustrating the upper end of one form of machine for making square bottom bags, the spreaders being collapsed;

6 is a view taken in the direction of the arrow 6 of Fig. 4:;

Fig. 7 is a top plan view of the machine of Figs. at and 5 with the folding table extended;

Fig. 8 illustrates one form of fiat bag without a formed bottom;

Fig. 9 illustrates the bottom of a bag hav ing a round formed bottom as made on the present machine; and

Fig. 10 illustrates a collapsed square bottom bag as made on the machine of the present invention.

A standard 11, which may be in the form of a heavy piece of square metal stock, is suitably mounted on the base 12, which may conveniently be a comparatively heavy piece of rolled steel. The upper end 12 of the standard is turned down as indicated, and a horizontal cross member 13 is fastened in place by a lock screw 13. Hinges 1 1, fas tened to the cross member, carry spreaders 15 shown in Fig. 3 in the form of semicircularpieces of metal. The ends of the cross member are provided with depending guides 13", for a purpose to be described.

A treadle or foot lever 16 is fastened on an angle iron 17 mounted on the base 12 and the opposite end 18 of the foot lever is connected by a link 19 to a lug 20 mounted on a rod 21. A lock nut 22 is provided for adjusting the position of the lug 20 along the rod. This rod is guided for vertical reciprocation alongside the supporting standard 11 by means of apertured lugs 23 and 2 1. Near the upper end of this rod another lug 25 is clan'iped by means of a lock nut 26 and links 27 and 28 connect the lugs with depending lugs and 30 carried underneath the spreaders 15.

A. latch member 31 is pivoted, as shown at to the standard 11. This latching member is connected by a rod 33 to a treadle 2'34; pivoted at -35 to the bottom of the standard. A. spring 36 tends to lift the treadle 34- and to push the latching member 31 over against a fixed stop 37, carried on the standard. The lug 20 is provided with a pro- ]ection 38 which may conveniently be an :ztension of the bolt used for fastening the link 19 to the lug. This projection is so disposed that, upon depressing the treadle 16 to raise the rod 21, it passes by the rear curved edge 39 of the latching member 31. whereupon the spring 36 forces the upper edge 10 of the latch underneath the projection 38. In this way the folding table made up of the spreaders 1515 is moved from the position of Fig. 1 to the position of 2. To restore the machine to the position of F 1, it is only necessary for the operator to depress the lever 34:, which releases the latching member and permits the meiilianisn i to drop either under the in fluence of gravity or of a spring 41, to the position of Fig. 1.

in operating the machine, parts are first moved to the position shown in Fig. 2. whereupon flat l'iag B having bottom seam 42 and a side seam 13 (as shown in Fig. 8) is opened up slightly and passed down over the collapsed Spreaders, being guided by the members 13". The position of such a bag is illustrated in dotted lines in Fig. 2. The operator then releases the. latching mechanism and permits the ma chine to assume the position shown in Figs. 1 and 3, the lugs 25 and 23 forming a stop. As shown in this position, the bag is spread out over the folding table, the corners 4:4 and 45 of the bag projecting above the folding table as indicated in dotted lines in Fig. 1. The operator then passes the hands about the ed e of the spreaders and then toward one another to fold the corners inwardly as indicated in This provides a formed bottom having a configuration of the top of the folding table. The operator then stops on the treadle 16 returning the pa s to the position shown in The bag with the forn'ied bottom is colla sed by the parts 16 and 47 toward. one anothe and the bag is withdrawn from the mael'iine in a collapsed condition ipady for shipn'ient. The guides .13" direct the movement of the bag and prevent injury of the bags by the ends of the cross iii-ember.

The supporting standard 11 and operating parts for the folding table may he made to fit any folding table, and the ma chine changed to operate on different sized bags by merely removing the lock screw 13, and the bolts fastening the links 27 and 28 to the lugs 29 and 30, and substituting the different sized parts.

The machine illustrated. in Figs. 4 to 7 inclusive has been designed for making square bottom bags with infolded side tucks. The lower end of the machine may be the same as the lower end of the machine of;

Figs. 1 and 2 and, therefore, the drawings illustrate only the upper end of the machine.

A supporting standard carries at its upper end a horizontal cross member 51, similar to the cross member 13 of Fig. 2. Spreaders 52-52 are mounted on the cross member 51 by means of hinges 53. In the form shown in the drawings, these are ordinary butt hinges with one strap 54 fastened to the cross member 51 by bolts 55 and. with theother strap fastened to the spread are 52 by rivets 56. Of courseany other suitable arrangement could be employed. The spreaders 52 are provided with depending lugs 57 to whichl-inks 58 and 59 are connected. These links extend downwardly in the same fashion as the links 27 and .28 of Fig. 1 and may be connected with similar operating mechanism.

Each of the Spreaders 52 is provided with slidab-le members 60 and 61 guided for lateral movement by studs 62 and 63 passing through slots 64 and 65. The studs 63 may be in the form of screws threaded into the sheet-metal of the Spreaders 52. while the studs 62 are preferably provided with a longer head through which the end of contractile sp'rings may be inserted. The slidable members 60 and 61 are ea'h provided with studs 66 similar to the studs 62 and contractile springs 67 are arranged between each of the pairs of studs 62 and 66. These springs act upon the slidable members 6-?) and 61 to move them to the extended position. as; shown in dotted lines in Fig. 6 and in Fig. 7, the studs 62 and 68 guiding the slidable members. Suitable offsets 68 are provided in the slidable members 60 and 61 to permit them to pass one another when in collapsed position, as is clearly shown in Figs. 4c and 6.

Near the extreme edge of the slidable members 60 and 61. cords 69 are attached and these cords are passed over pulleys 70 carried on lugs 57 and these cords are then carried down and fastened to a lug 71 on the standard 50.

In operating the machine of Figs. 4 to 7. the operator takes a bag, such as shown in Fig. 8. and places it over the machine when it in the position shown in Fig. 5. The operator then releases the latching mechanism and permits the spreading table to drop down into extended position, such as 61 in the form of triangular flaps, are

folded in toward the center of the table. The operator creases the bag around the outer edge of the spreading table, thereby completing the forming of the formed bottom in the'flat bag. The operator may then depress the treadle 16 to move the parts to the position of Figs. 4 and5. The operator presses the bag, illustrated in dotted lines in Fig. 7. inwardly at the points t t to initiate the infolded side tucks. The upward movement of the Spreaders is accompanied by a retracting of the spreader-s 60 and 61 so that the bag may be collapsed for shipment, the position of the bag being indicated in dotted lines in Fig. A finished is illustrated in Fig. 10. in which it will be noted that the parts 6 t have become the,

inner fold of the infolde'd side tucks and that the excess: PIOJQCUDg end portions have been folded inside the collapsed bottom, as

indicated at 72. The bag after being withdrawn from the machine is further collapsed to' the position shown in Fig. 10 and is then ready for shipment. If it is desired to make a square bottom bag with out infolded side tucks the operator may remove the bag from the machine in the manner discussed above with respect to the bottom is formed in'the bag thatwill fit the .bottom of a barrel or bO'K for which it is designed. Bags or linings made in the manner described have been found to make very sat= isfactory linings for barrels and large boxes and it has been found that they can be made ezi'ieditiously on machines of the above type. it is olwious that the machine as a whole and i-s different features, as herein shown and described, may be variously arranged without departing from the essentials of the invention. The present embodiment is the efore to be understood as illustrative rather than restrict ve. reference beii'ig had. to the Jpended ciaims rather than to-thc foregoing description to indicate the scope of the invention.

The formed bottom bag or lining and During this operation,

sit

method of making the same constitutes the subject matter of another application for Letters Patent.

What is claimed is:

1. A machine for torming bottoms in formless bottom bags, comprising a standard, Spreaders carried by the standard and collapsible to receive the bag, and means to move the Spreaders into a position to spread the bag.

2. A machine for forming bottoms in formless bottom bags comprisingspreading means having two positions in one of which it is folded edgewise to permit drawing thereon the ffOl'IlllGSS bottom bag, and in the other of which it spreads the bag, and means for moving the spreading means from one position to another.

3. A machine for forming bottoms in tormless bottom bags comprising a standard, spreaders disposed on opposite sides of the standard and adapted to occupy two positions, inone of which the spreaders are arranged parallel to each other to permit drawing thereon the tormless bottom bag, and in the other of which they are arranged in the same plane to spread the bag and provide a folding surface, and means on said standard for moving the spreaders from one position to another.

4. In combination, a standard, spreaders hinged opposite one another at the top of the standard and movable to provide a fiat tolding surface, means for simultaneously mov ing the Spreaders into said position, or to swing them toward one another about the hinges.

5. A machine for forming bottoms in formless bottom bags, comprising a standard, spreaders hinged to the top of the standard, a slidable member carried by ti 5 standard underi'ieath the Spreaders, members connecting the slidable member with the spreaders to move the same into either of. two positions, and a latch to hold the slid able member in the position in which the spreader-s are extended,

6. A machine for forming bottoms in tormless bottom bags, comprising a standard, a member mounted to move along the standard, spreader-s, and links intermediate the slidable men'iber and the spreaders. said links operating to move the spreaders into collapsed or extended position upon move ment of the slidable member.

7. A machine tor forming bottoms in formless bottom bags, COHlPl'iSl-HQ a standard, a member mounted to move vex-ti "ally along the standard, sprcaders. links intermediate the slidable member and the spread ers, said links operating to move the spreaders into collapsed or extended position upon movement of the slidable member, and means for moving the slidable member to extend the Spreaders.

8. A machine for forming bottoms in t'ormless bottom bags, comprising a standard, a member mounted to move vertically along the standard, spreaders, links intermediate the slidable member and the spreaders, said links operating to move the spread ers into collapsed or extended position upon movement oi a slidable member, and a treadle for moving the slidable member to extend the Spreaders.

9. A machine for forming bottoms in forinless bottom bags, comprising a standard, a member mounted to move vertically along the standard, Spreaders, links intermediate the slidable member and the spreaders, said links operating to move the spreaders into collapsed or extended position upon the movement of a slidable member, and a latch to hold the slidable member in said position.

10. A machine for forming bottoms in tormless bottom bags, comprising a stand ard, a member mounted to move vertically along the standard, spreaders pivoted to the upper end of the standard, links intermedia the slidable'member and the spreaders, said links operating to move the spreaders into collapsed on extended position upon movement of the slidable member, means for moving the slidable member to extend the spreaders, and a latch to hold the slidable member in said position.

11. A ,iachine for forming bottoms in tormles bottom bags, comprising a standard, a member mounted to move vertically along the standard, spreaders pivoted to the upper end of the standard, links intermediate the slidable member and the spread ers, said. links operating to move the spreaders into collapsed or extended position upon the movement of the slidable member, a latch to hold the slidable member in said position, and a treadle for releasing the latch to permit the spreaders to be colla )sed.

12. A machine for forming bottoms in tormless bottom bags, comprising spreading means and means for operating the spreading means into either of two positions, in one of which positions a formless bottom bag mav be placed over the spreading means. and in the other oi said positions the bag spread out to provide exprojecting end portions which may be oi TiOCl against the spreading means to make the formed bottom.

13. A machine for forming bottoms in tormless bottom bags, comprising spreading means and scans tor operating the spreading means into either of two positions. in ne ot which positions a tormless bottom bag may be placed over the spreading meme, aw in. the other or" said positions he l agr is pread out to provide excess projecting end portions which may be folded lUU lltl

against the spreading means to make the formed bottom, the spreading means tending to assume the first position aforesaid.

14. A machine for forming bottoms in formless bottom bags, comprising spreading means, means fer operating the spreading means into either of two positions, in one of which positions a formless bottom bag may be placed over the. spreading means, and in the other of said positions the bag is spread out to provide excess projecting end portions which may be folded against the spreading means to make the formed tottom. and means for holding the spreading means in the last mentioned position.

15. A machine for forming bottom-s in formless bottom bags comprising spreadmeans, means for operating the spreading means into either of two positions, in ne of which positions a formless bottom bag may be placed over the spreading means, and in the other of said positions the bag is spread out to provide excess profleeting end portions which may be folded rgainst the spreading means to make the formed bottom. the spreading means tending to assume the first position aforesaid, and means for holding the spreading means in the last mentioned position.

16. In combination, a standard, a member guided for vertical reciprocation along the standard, spreaders hinged to the standard, and connections between the spreaders and reciprocable member for operating the spreaders into extended or collapsed position.

17. Spreading means for flat bags without formed bottoms, comprising plates hingedly mounted along one edge, the periphery of said plates equaling approximately the periphery of the flat bags.

18. A machine for forming bottoms in formless bottom bags, comprising a standard, spreaders hinged to the top of the standard, means for upwardly swinging the spreaders, and means for retaining them in their upper position.

19. A machine for forming bottoms in formless bottom bags, comprising a standard, spreaders hinged to the top of the standard to have extended and collapsed positions, and a treadle for moving them to collapsed position.

20. In combination, a standard, spreaders hinged to the top of the standard, members slidably mounted on the spreaders, means for simultaneously moving the Spreaders into a position to provide a flat folding surface and for moving the slidably mounted members to extend the folding surface.

21. In combination, a standard, spreaders hinged to the top of the standard, members slidably mounted on the Spreaders, means for simultaneously moving the spreaders into a position to provide a flat folding surface and for moving the slidably mounted members to extend the folding surface, said means including a member slidably carried on the standard andinterconnected with both the Spreaders and the slidably mounted. members.

In combination; a standard; amember guided forvverticalreciprocation along the standard"; latching means for holding the member in elevated position; spreading devices mounted on the topof the standard and movable with collapse-d or extended position, said spreading devices including movably mounted members; and interconnections between the reciprocable member and the spreading devices and movably mounted members for moving the devicesand members into extended position when the reciprocable .member is lowered.

23. A collapsible spreading table for forming bottoms in formless bottom bags, comprising, a central member and two spreaders hinged to the opposite sides of the central member, said spreaders being inovable into a position to provide a flat table, and into a collapsed position.

24;. A collapsible spreading table for forming bottoms in formless bottom bags, comprising, a central member and two 'spreaders hinged to the opposite sides of the central member, said Spreaders being movable into a position to provide a flat table, and into a collapsed position, said Spreaders including slidably mounted extensions for increasing the area of the table.

25. A collapsible spreading table for forming bottoms in formless bottom bags, comprising, a central member, two spreaders hinged to the opposite sides of the central member, said spreaders being movable into a position to provide a fiat table, and into a collapsed position, said spreaders including slidably mounted extensions for increasing the area of the table, and devices for retracting the extensions when the table is collapsed.

26. A collapsible spreading table for forming bottoms in formless bottom bags, comprising, a central member, and two spreaders hinged to the opposite sides of the central member, said spreaders being movable into a position to provide a flat table and into a collapsed position, said Spreaders including slidably mount-ed spring controlled extensions for increasing the area of the table. l

27. A collapsible spreading table for forming bottoms in formless bottom bags, comprising, a central member, two spreaders hinged to the opposite sides of the central member, said Spreaders being movable into a position to provide a fiat table and into a collapsed position, said sp readers including slidably moimted spring controlled extensions for increasing the area of the table, and devices for retracting the extensions when the table is collapsed.

28. A machine for making bags with formed bottoms out of flat bags without formed bottoms, comprising spreaders on which the bottoms may be formed, and means for collapsing the spreaders with the formed bottom of the bag between them whereby the bag is collapsed for shipment.

29. A machine for making bags with formed bottoms out of flat bags without formed bottoms, comprising a horizontal bar, Spreaders hinged to the sides of the bar and movable upwardly toward one another to fold the formed bottom of the bag.

80. A machine for making bags with formed bottoms out of flat bags without formed bottoms, comprising a T-shaped standard, a rod sl'idably mounted alongside the vertical part of the standard, means for raising the rod, a latch for holding the rod in raised position, and releasably to permit the lowering of the rod, spreaders hinged to the horizontal part of the standard, and links interconnecting each spreader with the rod to move the spreaders upwardly about the hinges upon raising the rod, the spreaders dropping into extended position upon releasing of the latch.

31. A machine for making bags with formed bot-toms out of fiat bags without formed bottoms, comprising a T-shaped standard, a rod slidably mounted alongside the vertical part of the standard, means for raising the rod, a latch for holding the rod in raised position, and releasable to permit the lowering of the rod, spreaders hinged to the horizontal part of the standard, and links interconnecting each spreader with the rod to move the. spreaders upwardly about the hinges upon raising the rod, the spread ers dropping into extended position upon releasing of the latch, each of the spreaders being provided with laterally slidable extensions, means retracting the extensions upon raising the spreaders, and spring means for moving the extensions outwardly when the Spreaders are lowered.

32. A collapsible spreading table for forming bottoms in formless bottom bags, comprising spreaders movable into a position to provide a fiat table and into a collapsed position, said spreaders including dal'ily mounted extensions "for increasing the area of the table.

33, A collapsible spreading table for forming bottoms in formless bottom bags, comprising spreaders movable into a position to provide a flat table and into a collapsed position, said spreaders including slidably mounted extensions for increasing the area of the table, and devices for retracting the extensions when the table is.

collapsed FRANCIS T. ROBINSON, 

